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A kind of nickel-cobalt-manganese network structure precursor and nickel-cobalt-manganese composite oxide powder and its preparation method and application

A network structure, nickel-cobalt-manganese technology, applied in the field of materials, can solve the problems of low initial charge and discharge efficiency, and the power performance of materials cannot be effectively exerted, and achieve the effect of improving low-temperature power performance

Active Publication Date: 2022-05-20
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the lithium-ion battery corresponding to the precursor obtained by the existing co-precipitation crystallization method has a low initial charge and discharge efficiency, especially under low temperature conditions, and the power performance of the material cannot be effectively exerted, and provides a Nickel-cobalt-manganese network structure precursor and nickel-cobalt-manganese composite oxide powder capable of improving the first charge and discharge efficiency of lithium-ion batteries and improving power performance under low temperature conditions, and their preparation methods and applications

Method used

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  • A kind of nickel-cobalt-manganese network structure precursor and nickel-cobalt-manganese composite oxide powder and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0040] S1. Add nickel-cobalt-manganese composite metal (the molar ratio of Ni, Co, and Mn is 1:1:1), elemental zirconium, nitric acid, high-purity water, and sodium sulfate at the same time according to the molar ratio of 10:0.003:1:1:1 To the reactor, add 2g / L ammonium sulfate at the same time, under normal pressure conditions, control the ORP value at -100mv, control the concentration of complexing agent at 3g / L, control the conductivity at 200uS / cm, stir The input power is controlled at 1kw / m 3 h. The concentration of metal ions is controlled at 5g / L, the pH value is controlled at 6-8, and the temperature is controlled at 20°C to carry out chemical corrosion precipitation reaction to form a loose inner core, and the growth rate of precipitated particles during the chemical corrosion precipitation reaction process (Detected by a laser particle size analyzer, the same below) is 2μm / 10h. Water is continuously consumed during the reaction and no excess waste water is produced. ...

Embodiment 2

[0045] S1. Combine nickel-cobalt-manganese composite metal oxide (the molar ratio of NiO, CoO, and MnO is 5:2:3), tungsten oxide, nitric acid, high-purity water, and sodium chloride according to the molar ratio of 10:0.03:1:1:1. The flow is added to the reactor at the same time, and 7g / L of ethylenediaminetetraacetic acid is added at the same time. Under normal pressure conditions, the ORP value of the oxidation-reduction potential is controlled at 100mv, the concentration of the complexing agent is controlled at 8g / L, and the conductivity is controlled at 500uS / cm, stirring input power controlled at 0.7kw / m 3 h. The metal ion concentration is controlled at 5g / L, the pH value is controlled at 8-10, and the temperature is controlled at 60°C to carry out chemical corrosion precipitation reaction to form a loose inner core, and the growth rate of precipitated particles during the chemical corrosion precipitation reaction process It is 2.8μm / 10h, water is consumed continuously dur...

Embodiment 3

[0050]S1. Combine nickel-cobalt-manganese composite metal (the molar ratio of Ni, Co, and Mn is 6:2:2), elemental tungsten, oxygen, high-purity water, and sodium chloride in parallel at the same time according to the molar ratio of 10:0.003:1:1:4 Add it into the reactor and add 4g / L ammonium nitrate at the same time. Under normal pressure, control the ORP value at 0mv, the conductivity at 1000uS / cm, and the stirring input power at 0.1kw / m 3 h. The metal ion concentration is controlled at 5g / L, the pH value is controlled at 10-11, and the temperature is controlled at 90°C to carry out chemical corrosion precipitation reaction to form a loose inner core, and the growth rate of precipitated particles during the chemical corrosion precipitation reaction process It is 3.2μm / 10h, water is consumed continuously during the reaction process, and no excess waste water is produced. After 30 hours of reaction, the precipitation cycle reaches 50%. Oxygen is introduced at a rate of 8L / h and ...

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Abstract

The invention belongs to the field of materials, and relates to a network structure precursor and composite oxide powder, a preparation method and application thereof. The precursor of the network structure includes a loose inner core and a loose outer shell covering the surface of the loose inner core. The main component of the loose inner core is divalent nickel-cobalt-manganese composite hydroxide, and the main component of the loose outer shell is three A nickel-cobalt-manganese composite hydroxide, and the particle size of the nickel-cobalt-manganese network structure precursor is 2-30 μm. The lithium-ion battery corresponding to the precursor of the network structure provided by the present invention has a first-time charge-discharge efficiency of ≥95% at 0.2C and a first-time charge-discharge efficiency of ≥92% at 10C under low temperature (‑10°C) conditions, which can improve low-temperature power performance , with great industrial application prospects.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a precursor of nickel-cobalt-manganese network structure, nickel-cobalt-manganese composite oxide powder and a preparation method and application thereof. Background technique [0002] With the application of lithium-ion batteries in electric vehicles, lithium-ion battery cathode materials have received extensive attention. The performance of lithium-ion battery cathode materials directly affects the use and promotion of electric vehicles, and the development of high-endurance, high-safety, low-cost The cathode material is the main direction of future development. The main directions of vehicle-mounted cathode materials are lithium iron phosphate, multi-component materials, and lithium manganese oxide. Among them, lithium iron phosphate is widely used in the EV market due to its high safety, long cycle and low cost. With the advancement of technology, multi-component materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525C01G53/00H01M4/505H01M10/0525
CPCC01G53/006C01G53/44H01M4/505H01M4/525H01M10/0525C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 马跃飞洪礼训李权余康杰
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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